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Securities (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)
Securities [Abstract]
Securities evaluated for other than temporary impairment | security	10		10
Available-for-sale Securities, Gross Realized Gains	$ 0		$ 644	$ 291
Available-for-sale Securities, Gross Realized Losses	0	$ 0	0	0
Held-to-maturity securities sales	$ 0	$ 0	$ 0	$ 0

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- Definition

Number of securities evaluated for other than temporary impairment.

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- Definition

Amount of debt and equity financial instruments classified as either held-to-maturity or available-for-sale.

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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